Lipopolysaccharide (LPS) andb-glucan from Francisella victoria, a fish pathogen and close relative of highly virulent mammal pathogenFrancisella tularensis, have been analyzed using chemical and spectroscopy methods. The polysaccharide part of the LPS was found to contain a nonrepetitive sequence of 20 monosaccharides as well as alanine, 3-aminobutyric acid, and a novel branched amino acid, thus confirmingF. victoriaas a unique species.